I am a Mac newbie and enjoying it more every day, but I can't always figure out how to do something on here right away that I used to be able to do on my PC. Usually once I do though, it is amazing how much easier it is on a Mac. How do I change the image size and file size of a pic? Do I need a 3rd party application, or can I do it in iPhoto? I don't see any options for that. Thanks!